Buckeye feed mills makes a really neat feed specifically for layers from 12 weeks on. I've not used it yet, but am planning on it for my current babies:

FEATURES:

Complete feed for pullets from 12 weeks until they begin to lay
Contains higher levels of fiber and lower in energy than Buckeye Starter Grower Crumbles Designed to control body weight and delay sexual maturity in order to reduce the incidence of "blowouts" and premature egg laying

I would use the grower if I could find it. The only feedstore that carries Buckeye never has grower. Buckeye feeds are good feeds, IMO, if you can find them locally. I understand grower slows down the sexual development so they dont come into lay too early and have issues. I just feed starter/grower combo till they get to layer age. Works fine, uncomplicated.

All feed is expensive nowadays, but there are significant differences in the price of starter, layer, finisher, etc. I posted this same response in a thread yesterday, but cant remember where, so I will suggest what I suggested to them.
Don't worry yourself into a tizzy over feed. Think about people your grandparent's age. All they ever fed chickens was corn and table slop, and they were fine. Now they claim you need special feeds and supplements, and they must be switched from this one to that one at a certain time..etc It just causes undue stress. I have birds of different ages in the same run, and they all get the same feed. Mostly whatever's on sale that week. I have fed layer pellets to chicks, chick starter to hens, and quail feed to chickens,and have never lost a chicken to malnutrition, blowouts, or digestive problems. It just doesnt make that much difference is all I'm saying. Of course the companies that make the feed want you to think otherwise, though.

Well, I have been giving them chick starter til they are old enough to go outside. (Here about 3-3.5 months) Then I give them scratch grains and then when they are big enough to be out in the big run I give them layer grains. I always give them plenty of oyster shell. I am just hoping I am not delaying their laying. (No pun intended ) and of course they get table scraps too.